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Stock-Based Compensation Plans (Tables)
 9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Compensation Expense (in thousands

    Three Months ended   Nine Months ended  
    September 30,   September 30,  
    2017   2016   2017   2016  
Stock option grants   $ 33       31       143       94  
Annual director stock award     —         —         445       412  
    $ 33       31       588       506  
Summary of Stock Activity (in thousands, except share and per share amounts)

      Weighted   Weighted   Weighted
  Number   Average   Average   Average
  Of   Exercise   Remaining   Grant Date
Options Shares   Price   Term (yrs)   Fair Value(000's)
Outstanding at                              
  January 1, 2017   236,385     $ 25.35       6.1     $ 2,440  
    Granted   4,555     $ 37.55             $ 75  
    Modification   —       $ 30.21             $ (137 )
    Exercised   (84,630 )   $ 25.13             $ (783 )
Outstanding at                              
  September 30, 2017   156,310     $ 25.82       5.5     $ 1,595  
Exercisable at                              
  September 30, 2017   114,020     $ 23.83       4.7     $ 1,010  
Vested during                              
  nine months ended                              
  September 30, 2017   26,839                     $ 223